/Engine/Source/Runtime/Experimental/Chaos/Public/PBDRigidActiveParticlesBuffer.h
Solver specific data buffered for use on Game thread
struct FPBDRigidDirtyParticlesBufferOut
TArray<FSingle...
DirtyGameThreadParticles
TSet<IPhysicsP...
PhysicsParticleProxies
Some particle types (clustered) only exist on the game thread, but we still need to pull data over via their proxies.